There are three major holy days in the Christian year. 1) Christmas because we needed first had experience of what God was like. 2) Easter because once we found out what God was like we knew we needed some assistance and so He forgave. 3) Pentecost because we had no way to live appropriately without the presence of the Holy Spirit in us. That means that we need to live out his call in us with streams of living water flowing from our lives.